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Fair Value Measurements - Narrative (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Mar. 18, 2021
Dec. 31, 2020
Dec. 28, 2020
Aug. 13, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Investments in unconsolidated subsidiaries at fair value using NAV $ 95,600   $ 95,600     $ 66,300    
Asset impairments 0 $ 0 0 $ 75,171        
Notes payable on real estate $ 128,700   $ 128,700     $ 79,600    
4.875% Senior Notes | Senior Notes                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Interest rate of long-term debt 4.875%   4.875%         4.875%
2.5% Senior Notes | Senior Notes                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Interest rate of long-term debt 2.50%   2.50%   2.50% 2.50%    
5.25% Senior Notes | Senior Notes                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Interest rate of long-term debt             5.25%  
Redemption of debt instrument             $ 425,000  
Estimated Fair Value                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Senior term loans $ 770,400   $ 770,400     $ 772,200    
Estimated Fair Value | 4.875% Senior Notes | Senior Notes                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Senior notes 696,300   696,300     702,500    
Estimated Fair Value | 2.5% Senior Notes | Senior Notes                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Senior notes 507,200   507,200          
Actual Carrying Value                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Senior term loans 771,800   771,800     785,700    
Actual Carrying Value | 4.875% Senior Notes | Senior Notes                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Senior notes 595,000   595,000     $ 594,500    
Actual Carrying Value | 2.5% Senior Notes | Senior Notes                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Senior notes $ 487,600   $ 487,600          
Global Workplace Solutions                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Asset impairments       50,200        
Real Estate Investments                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Non-cash goodwill impairment charge       $ 25,000